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信息发布者：

D

polluted

increase

planet

risk

uncomfortable

rapid

disadvantage

challenging

dried

possibility

get ill from drinking cold water

fly at the speed of light

Compared with your city

is not so crowded

more and more serious because of the rapid increase of private cars

feel like we were inside it

first

himself

children

to discover

challenging

was sent

of

comparing

how

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